/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package hivemall.math.matrix.builders;

import hivemall.math.matrix.sparse.DoKMatrix;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;

public final class DoKMatrixBuilder extends MatrixBuilder {

    @Nonnull
    private final DoKMatrix matrix;

    private int row;

    public DoKMatrixBuilder(@Nonnegative int initSize) {
        super();
        this.row = 0;
        this.matrix = new DoKMatrix(initSize);
    }

    @Override
    public DoKMatrixBuilder nextRow() {
        row++;
        return this;
    }

    @Override
    public DoKMatrixBuilder nextColumn(@Nonnegative final int col, final double value) {
        matrix.set(row, col, value);
        return this;
    }

    @Override
    public DoKMatrix buildMatrix() {
        return matrix;
    }

}
